The dark cloud B68 at different wavelengths

B68 is a dark cloud situated at a distance of about 500 light-years (160 pc) towards the southern constellation Ophiuchus (The Serpent-holder). This image represents the sky area of the so-called Bok globule Barnard 68 --- nicknamed the Dark Cloud -- imaged in six different wavebands, clockwise from the blue to the near-infrared spectral region. Three of these frames ("blue" B-band at wavelength 440 nm = 0.44 µm; "green-yellow" V-band at 0.55 µm; near-infrared I-band at 0.90 µm) were obtained with the FORS1 instrument at the VLT ANTU telescope and three with SOFI at the NTT through near-infrared filters (J-band at 1.25 µm; H-band at 1.65 µm; Ks-band at 2.16 µm). It is evident that the obscuration caused by the cloud diminishes dramatically with increasing wavelength. Since the outer regions of the cloud are less dense than the inner ones, the apparent size of the cloud also decreases, as more background stars shine through the outer parts. Each frame covers an area of 4.9 x 4.9 arcmin 2. North is up and East is left.

Bildnachweis:

ESO

Über das Bild

ID:eso9934b
Typ:Beobachtung
Veröffentlichungsdatum:2. Juli 1999
Dazugehörige Veröffentlichungen:eso9934
Größe:3727 x 2480 px

Über das Objekt

Name:B 68, Barnard 68
Typ:Milky Way : Nebula : Appearance : Dark : Molecular Cloud
Milky Way : Nebula : Appearance : Dark : Bok Globule
Entfernung:500 Lichtjahre
Kategorie:Nebulae

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Farben & Filter

SpektralbereichWellenlängeTeleskop
Infrarot
K
2.16 μmNew Technology Telescope
SOFI
Infrarot
H
1.65 μmNew Technology Telescope
SOFI
Infrarot
J
1.25 μmNew Technology Telescope
SOFI
Infrarot
I
900 nmVery Large Telescope
FORS1
Optisch
V
550 nmVery Large Telescope
FORS1
Optisch
B
440 nmVery Large Telescope
FORS1